“Myasthenia gravis (my-us-THEE-nee-uh GRAY-vis) may also be called MG. The name means serious muscle weakness, which is the main symptom. This muscle weakness often shows up in the face, with drooping eyelids being an early sign. Double or blurred vision, caused by weakness in the eye muscles, is another common symptom. Muscle weakness can extend to arms and legs. Smiling, chewing, swallowing and breathing can also be affected. MG is complicated. Every person who has it can have a slightly different experience.  That means MG is caused by your immune system not working the way it’s supposed to—it’s overactive. MG is not genetic (inherited), and it’s not contagious. It sometimes runs in families, but the reasons some people get it aren’t fully understood.’

MG United (https://www.mg-united.com)